Dental pliers.



' no. 69|,694. Patented 1an. 2|, 1902. A., .La H. Anim-:3.

lmawnu. mans. (Appumion and Ap. i1. 1901.)

(No Model.)

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UNITED STATES vPATENT GFFIC.

ADOLPII ADERERJULIUS ADERER, AND HUG@v ADERER, OF NEW YORK, N. Y.

DENTAL PLIERS.

SPECIFICATION forming. part of Letters `Patent N o. 691,694, dated JanuaryQl, l1902.

lippnmionaianpr'n11,1901.'serialnaeazra (Nomad.)

To all whom, it may concern,.- l Beit known that we, ADOLPH ADERER, JULIUs ADERER, and HUGO ADERER, citizens of the United States, residingat the city of New York, in the county of New York and State of NewYork, have invented certain new and useful Improvements in DentalPliers, of which the following is a full, clear, and exactspecification.

This invention relates to dentalpliers; and its `object is to construct.improved pliers which shall be adapted for use in forming and vshapingdental crowns. The method most generally employed in making these crowns`l 5 is to rstconstrnct a die corresponding, particularly as to thegrinding-surfaces of the tooth, `tothe desired crown and then to form acrown-blank upon this die. Our invention more particularly relates to animproved con-v zo struction of pliers of the kind adapted especially toform and shape/the crown and its grinding-surfaces or to re-form orreshape the same without the use of the die-plates and also adapted toconveniently change the shape of the surfaces of the crown when thelatter has already been formed by the method above described.

The invention will be more particularly described with reference to theaccompanying 3o drawings, in which- Figurel is a perspective view ofapair of pliers modifying our invention. Fig. 2 is a sectional view ofthe jaws, taken on the line :n m and looking from the rear. Fig. 3 is aperspective View of a modified form of the pliers. Fig. 4 is a sectionalview taken on the line y y in Fig. 3 and looking from the rear; andFigs. 5, 6, 7, 8, and 9 are perspective views of crowns in variousstages of forma- Referring more particularly to the drawings, 1 and 2represent therespective jaws of the pliers, which are pivoted at 3 and'moved by the handles 4 and 5 in the usual manner.A

The jaw I projects forward beyond the jaw 2 and is pointed at its `outerend. Its under side is provided with a slightly-curved or substantiallyiiat surface 6. In the modication for the band of the crown and meetsthe up-v per jaw at a pronounced angle thereto. Its

Aextreme end Sis rounded, and the rounded end impinges against the flatsurface 6 when they pliers are closed.k shown inv Fig. -3 the tworounded surfacesvS 8 `impin ge against the respective flattenedcomplementary surfaces 6 6.

n In the operation of the device, assuming that-a crown is to be formed,the usual blank `crown, as shownin Fig. 5, is used as a basis forthe'crown. The pliers shown in Fig. 3 are' used to form thebiting-surface contours, and to do this the under jaw 2 is placed ,in-v

In the modification side the crown, the point vof jaw l reaching 5 tonear thecenter of the top of the blank. By forcing the jaw together theindentation 9 is made in the upper edge of the vjaw and the raisedportions 10 10 are formed on each side of the depression. At the sametime the point of jaw l slightly'depresses thecenter, as at 11. Byrepeating this operation upon the four sides of the crown the blank willbe shaped substantially as shown in Fig. 6. now this b1ank,with thebiting-surfaces,needs reshaping-for instance, assume that one'of thecusps lO is too high and needs depressing-this may be donebynsubstantially the same operation as heretofore described, but withgreater pressure. In Fig. 7 the increased depressions are shown at 9 9.If the central depression 11 is not deep enough, this may beincreased byusing the pliers shown in y if n Fig. 1, the rounded ends of jaw 8 beingplaced crown may be formed or shaped in various ways by the use of thepliers herein described. Having thus described our invention, we declarethat what we claim as new, and desire to secure by Letters Patent, is-

1. Apair of pliers having two foi-min g-jaws,

Any or all of the various cusps or deone of which is sharply bent forclearance and in such manner that it meets the other jaw at a pointinside its extremity and at a pronounced angle thereto, said jaw havinga rounded end and said first-named jaw having a substantially fiat undersurface conlplementary tosaid rounded end, substantially as described.

2. Apairof pliers having two forming-jaws one of which is sharply bentfor clearance and in such manner that it meets the other jaw at a pointinside its extremity and at a pronounced angle thereto, said jaw having

